This study aims to extend the light spectrum which could be absorbed by TiO2 to infrared ray light (IR) by loading P4O10 in order to promote the CO2 reduction performance of TiO2 photocatalyst. Three ranges of light with P4O10/TiO2 film are studied, which are ultra violet light (UV) + visible light (VIS) + IR, VIS + IR, and IR only. This study also investigates the impact of molar ratio of CO2/H2O or CO2/NH3 on the CO2 reduction characteristics of P4O10/TiO2 film. The largest CO2 reduction performance in case of CO2/H2O and CO2/NH3 is obtained at CO2:H2O = 1:1 and CO2:NH3 = 3:2 respectively, irrespective of light illumination condition. With IR light illumination only, the largest molar quantity of CO per unit weight of photocatalyst for P4P10/TiO2 film in case of CO2/H2O and CO2/NH3 is 2.36 mmol/g and 33.4 mmol/g, respectively.
Gas movement around and/or through the photocatalyst is thought to be an inhibition factor to promote photocatalytic CO2 reduction performance. In this study, a hypothesis is put forward that the natural thermosiphon movement of gases around the photocatalyst can be improved by using black body material/surface. The black body material/surface that is placed underneath the photocatalyst in the reactor would be heated by absorbing light and then this heats up the gases to promote their movement around/through the photocatalyst. The aim of this study is to prove or disprove this hypothesis by conducting CO2 reduction performance of a TiO2 photocatalyst with NH3 under the conditions without black body material (W/O B.B.), with one black body material (W B.B.-1), and with three black body materials (W B.B.-3). The impact of molar ratio of CO2/NH3 on CO2 reduction performance is also investigated. This study revealed/proved that the hypothesis worked and that the CO2 reduction performance is promoted more with W B.B.-3 compared to that with W B.B.-1. The maximum concentration of formed CO with W B.B.-3 is two to five times as large as that under the condition W/O B.B.
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